DNA疫苗的不同构象在体内外表达差异研究
Study on differences in expression levels in vitro and in vivo between different conformational forms of DNA vaccine
分类号：
出版年·卷·期（页码）：2013,33 (8):0-0
DOI:
10.16155/j.0254-1793.2017.01.01
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目的:研究DNA疫苗构象对体内和体外表达的影响。方法: 分别构建绿色荧光蛋白表达质粒(pcDNA3.1-EGFP)和萤火虫荧光素酶表达质粒(pDRVISV1.0-Fluc),对其存在的3种拓扑形式(包括超螺旋、线性、闭环切刻等)和反复冻融状态对表达效率的影响进行分析,前者用脂质体介导转染293FT细胞,用流式细胞仪检测EGFP的表达情况;后者通过接种BALB/c小鼠,用活体成像技术监测荧光素酶的表达情况。结果: 对pcDNA3.1-EGFP质粒,流式细胞仪检测其转染293FT细胞48 h后显示,4种处理组的质粒表达EGFP的效率和荧光强度有所差异,依次为新鲜制备质粒(89.76%,2682.68)>反复冻融处理质粒(76.35%,2313.48)>闭环切刻质粒(68.45%,1245.95)>线性质粒(38.28%,929.5)。对pDRVISV1.0-Fluc质粒,采用小鼠活体成像技术持续观察接种后28 d的体内荧光素酶的荧光信号强度情况,结果显示:接种后0.2 d观察到荧光,之后强度持续开始增强,至第5 d达到平台期,维持至18 d。质粒各处理组的荧光强度组间有显著差异,依次为新鲜制备质粒(108.6)>反复冻融处理质粒(108.4)>线性质粒(108.3)>切刻质粒(108.0)。2种质粒不同构象的体内体外表达中,均是新鲜制备质粒的表达量最高,因其中超螺旋为其主要构象。结论: 质粒中超螺旋比例高时其转染效率及表达量最高,提高超螺旋比例是DNA疫苗质量控制的关键。
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